DE102016212383A1 - Commercial vehicle tires - Google Patents

Abstract

A commercial vehicle tire of a radial type comprising a tread (1), a carcass ply (3) and a belt bandage (2) of at least four belt plies (6 to 10), wherein the belt ply located in the second or third belt ply position is 0 ° Belt layer (8) which has a width (b1) of 70% to 90% of the ground contact surface width (B) and consists of a steel cord (11) wound in a single layer in a spiral of circumferentially revolving turns, the further belt layers ( 6, 7, 9, 10) each having mutually parallel and extending at an acute angle to the circumferential direction, embedded in a rubber coating steel cords. The 0 ° belt layer (8) has lateral sections (8b, 8'b), in which the steel cord windings are located directly on the belt layer (6, 7) arranged radially inside the 0 ° belt layer (8), wherein the Steel cord windings in the portions of the 0 ° belt ply (8) adjoining the side portions (8b, 8'b) are located on a separate thin rubber layer (12, 13) disposed between radially inside the 0 ° belt ply (8) Belt position (6, 7) and the 0 ° belt layer (8) is positioned.

Description

The invention relates to a radial-type commercial vehicle tire having a tread, a carcass ply and a belt bandage of at least four belt plies, wherein the belt ply located in the second or third belt ply position is a 0 ° belt ply having a width of 70 % to 90% of Bodenaufstandsflächebreite and consists of a steel cord which is wound in a single layer spirally from circumferentially circumferential turns from edge to edge, the other belt layers each parallel to each other and extending at an acute angle to the circumferential direction, embedded in a rubber lining steel cords exhibit.

It is known to provide in belt assemblies of commercial vehicle tires, a 0 ° belt ply of a spiral wound in the circumferential direction of the tire steel cord. 0 ° belt layers in the belt bandage are advantageous for the circumferential rigidity of the commercial vehicle tire, even out or reduce the abrasion of the tread and increase the overall durability of the belt association. A uniform and as high as possible circumferential rigidity over the tread width is one of the parameters responsible for low tread wear. One of the factors that affects the circumferential stiffness achievable with a 0 ° belt ply is the preload with which the steel cord is applied during the winding process. This winding process begins at the one edge of the 0 ° belt ply to be created and continues continuously over the axial width in the circumferential direction of the tread until the second edge of the 0 ° belt ply is reached. In the peripheral windings now the original bias due to the loose ends of the steel cord located here is not preserved, in particular, a part of this bias is lost especially during the buffing of the green tire.

Commercial vehicle tires of the type mentioned above with a 0 ° belt layer are known in a large number of designs, also from the patent literature. For example, the EP 1 754 615 B1 a commercial vehicle tire with a belt bandage having at least three belt plies, the second belt ply configured as a 0 ° belt ply. From the DE 10 2010 000 181 A1 For example, a commercial vehicle tire having a belt bandage having at least four belt layers is known in which also the second belt ply is a 0 ° belt ply. In the from the DE 10 2014 209 423 Known commercial vehicle tire with a belt at least four-layered with steel cords as strength members, the first belt layer is a 0 ° belt layer.

The invention is based on the object to make a commercial vehicle tire of the type mentioned in such a way that caused by the loose ends of the steel cord in the edge portions of the 0 ° belt layer lower bias is no longer given, preferably even the bias in the edge sections the 0 ° belt layer may be higher than in the middle region of the 0 ° belt layer.

The object is achieved according to the invention in that the 0 ° belt layer has lateral sections in which the Stahlkordwindungen are located directly on the radially disposed within the 0 ° belt layer belt layer, wherein the Stahlkordwindungen in the adjoining the lateral portions of the areas 0 ° belt layer are on a separate thin rubber layer, which is positioned between the radially disposed within the 0 ° belt layer belt layer and the 0 ° belt layer.

In a commercial vehicle tire according to the invention, therefore, those steel cord coils located in the peripheral portions of the 0 ° belt ply have a smaller circumferential length than those located in the adjoining regions of the 0 ° belt ply. Therefore, on the green tires, greater stress has been applied to the side portions of the 0 ° belt ply during the crowning process than in those areas where steel cord coils are positioned on a rubber ply. As a result, in a tire embodied according to the invention, the pretensioning of the steel cords in the 0 ° belt ply in the lateral regions can be substantially the same as that in the other regions of this belt ply. The finished tire may therefore have the desired circumferential stiffness over its width in the tread area. A uniform circumferential stiffness is, as mentioned above, especially for a uniform wear of the tread of advantage.

In a preferred embodiment of the invention, the lateral portions of the 0 ° belt ply have an axial width of 5% to 15% of the width of the 0 ° belt ply. With lateral sections of this width, a uniform circumferential stiffness can be achieved particularly well.

Particularly advantageous is an embodiment of the invention in which the rubber layer extends continuously between the lateral sections of the 0 ° belt ply. A tire with a continuous rubber layer can be easily produced.

In a favorable for the rolling resistance of the tire design, two rubber layers with an axial width of 10% to 20% of the Width of the 0 ° belt layer are provided, wherein in the area between the rubber layers, the 0 ° belt layer is located directly on the radially disposed within the 0 ° belt layer belt layer.

The desired effect can be optimally achieved with one or two rubber layers which have a substantially constant thickness of 1 mm to 2 mm.

Further features, advantages and details of the invention will now be described with reference to the drawing, which schematically illustrates embodiments. Show

1 and 2 Cross sections through the radially outer region of a commercial vehicle tire with one embodiment of the invention.

All dimensions given in the specification and in the claims relate to the vulcanized unmounted tire.

In 1 and 2 are each of the essential components of a commercial vehicle tire in Radialbauart a tread 1 , a belt bandage 2 , a carcass ply 3 , an airtight inner layer 4 and the radially outer portions of sidewalls 5 shown. The carcass insert 3 , the inner layer 4 , the tread 1 as well as the other tire components not shown may be performed in a conventional manner. In 1 and 2 is also the ground contact patch width of the tread 1 labeled B.

The one between the tread 1 and the carcass ply 3 located belt bandage 2 has in the illustrated embodiments, five belt layers 6 . 7 . 8th . 9 and 10 on. The fifth, radially outermost belt layer 10 is commonly referred to as a protective layer and has the smallest width of all belt layers 6 to 10 on. The first, radially innermost belt layer 6 is the so-called blocked position, the second belt layer 7 and the fourth belt layer 9 are the so-called working situations and are also referred to as such below. The working situations 7 . 9 are wider than the radially innermost and the radially outermost belt layer 6 . 10 , wherein the further radially inner working position 7 wider than the second work situation 9 , Between the two working situations 7 and 9 is located as a third belt layer a 0 ° belt layer 8th ,

The belt layers 6 . 7 . 9 and 10 each consist of embedded in a Gürtelgummierung steel cords conventional design, the steel cords in each belt position 6 . 7 . 9 and 10 are substantially parallel under the usual distances. The steel cords in the belt layers 6 . 7 . 9 and 10 further extend to the circumferential direction of the tire at the usual angles, in the individual belt plies 6 . 7 . 9 and 10 may be different, the angles are selected in particular in a range of 10 ° to 75 °. The mutual arrangement of steel cords in some or all belt layers 6 . 7 . 9 and 10 is in particular such that the steel cords intersect in a conventional manner. The actual arrangement of the steel cords in these belt layers 6 . 7 . 9 and 10 is not the subject of the invention and can be done according to the prior art.

The already mentioned 0 ° belt layer 8th has a width b ₁ of 70% to 90% of the width B and consists of a plurality of side by side and mutually parallel turns of a single circumferentially wound steel cord 11 , The Stahlkordwindungen therefore run almost in the circumferential direction, they can deviate from this up to an angle of 5 °.

At the in 1 shown embodiment is located on the working position 7 an additional, thin rubber layer arranged symmetrically to the equatorial plane of the tire 12 whose width b _{2 is} 70% to 90% of the width b _{1 of} the 0 ° belt layer 8th is. The 0 ° belt layer 8th therefore has a middle section 8a which is on the rubber layer 12 and whose width is the width b _{2 of} the rubber layer 12 corresponds, and two lateral sections 8b which is directly related to the work situation 7 are and a width b ₄ of 5% to 15% of the width b ₁ 0 ° belt layer 8th exhibit. In the tire or belt construction, the 0 ° belt layer 8th by spirally winding the steel cord 11 created in the circumferential direction, starting at the marginal edge of a side section 8b , Winding this section 8b , Winding the section 8a on the still unvulcanized mixture layer for the rubber layer 12 and winding the second lateral portion 8a , In the vulcanized tire, the rubber layer points 12 a substantially constant thickness of 1.0 mm to 2.0 mm. The rubber layer 12 is preferably based on a rubber compound which corresponds to the rubber mixture of the belt layer rubbers.

At the in 2 shown embodiment, there are two narrow rubber layers 13 directly on the work situation 7 within the range of the width b ₂ from 70% to 90% of the width b _{1 of} the 0 ° belt layer 8th and each immediately adjacent to one of the lateral edges of this area. The rubber layers 13 also have a thickness of 1.0 mm to 2.0 mm, its width is b ₃ 10% to 20% of the width b ₁ of the 0 ° -Gürtellage 8th , The 0 ° belt layer 8th therefore has two lateral sections 8'b with the width b ₄ , which is directly on the working position 7 There are two intermediate sections 8'c , which are each on one of the rubber layers 13 and between the rubber layers 13 a middle section 8'a , which in turn is directly on the work situation 7 located.

The circumferential length of the turns of the steel cord in the 0 ° belt layer 8th is in the side sections 8b . 8'b less than in the section 8a ( 1 ) or the sections 8'c ( 2 ), which is on a rubber layer 12 . 13 located or located.

When building the green tire, the 0 ° belt layer 8th on a building drum on the already applied working position 7 and on the rubber compound sheet for the rubber layer positioned thereon 12 or on the rubber compound strips for the rubber layers positioned thereon 13 spirally wound up in one. The green tire is then cambered together with the belt bandage, the steel cord coils in the 0 ° belt layer 8th to be subjected to an elongation. Because the circumferential length of the steel cord coils in the lateral sections 8b . 8'b less than in those on a rubber layer 12 . 13 The tension increase in the steel cord coils is in the lateral sections 8b . 8'b by the Bombiervorgang larger than in the or on the rubber layers 12 . 13 located Stahlkordwindungen. In this way, a compensation of the present in the lateral areas of 0 ° belt layers, caused by the here located loose ends of the steel cord, achieve lower bias of the steel cord.

In accordance with the invention executed tire therefore can be both over the entire width of the 0 ° belt layer 8th achieve uniform prestressing of the steel cord windings as well as fundamentally influence the stress distribution and thus influence the circumferential stiffness of the vulcanized tire. In particular, in a commercial vehicle tire according to the invention, the circumferential stiffness in the lateral regions of the tread may be greater than in the central region due to a higher bias of the steel cord windings in the lateral regions of the 0 ° belt ply.

In a further variant of the invention, not shown, the 0 ° belt layer may be located between the first belt ply and the radially inner work ply, in which case the rubber layer or layers are on the first belt ply. Furthermore, the belt bandage can have a total of four belt plies, in particular comprising a blocking ply, a 0 ° belt ply and two working plys.

LIST OF REFERENCE NUMBERS

1

tread

2

belt Association

3

carcass

4

inner layer

5

Side wall

6, 7, 9, 10

belt layer

8th

0 ° -Gürtellage

8a, 8'a, 8b, 8'b

section

8'c

intermediate section

11

steel cord

12, 13

rubber layer

B

Ground contact area width

b ₁ , b ₂ , b ₃ , b ₄

width

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1754615 B1 [0003]
• DE 102010000181 A1 [0003]
• DE 102014209423 [0003]

Claims (5)

Commercial vehicle tire in radial construction with a tread ( 1 ), a carcass ply ( 3 ) and a belt bandage ( 2 ) from at least four belt layers ( 6 to 10 ), wherein the belt ply, which is in the position of the second or the third belt ply, a 0 ° belt ply ( 8th ) which has a width (b ₁ ) of 70% to 90% of the ground contact surface width (B) and of a steel cord ( 11 ), which is wound in a single layer spirally from circumferentially rotating turns, wherein the other belt layers ( 6 . 7 . 9 . 10 ) each having mutually parallel and running at an acute angle to the circumferential direction, embedded in a rubber lining steel cords, characterized in that the 0 ° belt layer ( 8th ) lateral sections ( 8b . 8'b ) in which the steel cord windings lie directly on the radially inside of the 0 ° belt layer ( 8th ) arranged belt layer ( 6 . 7 ), with the steel cord windings in the lateral sections ( 8b . 8'b ) subsequent areas of the 0 ° belt layer ( 8th ) on a separate thin rubber layer ( 12 . 13 ) located between the radially inside the 0 ° belt layer ( 8th ) arranged belt layer ( 6 . 7 ) and the 0 ° belt layer ( 8th ) is positioned. Commercial vehicle tire according to claim 1, characterized in that the lateral sections ( 8b . 8'b ) of the 0 ° belt layer ( 8th ) has an axial width (b ₄ ) of 5% to 15% of the width (b ₁ ) of the 0 ° belt layer ( 8th ) exhibit. Commercial vehicle tire according to claim 1 or 2, characterized in that the rubber layer ( 12 ) between the lateral sections ( 8b ) of the 0 ° belt layer ( 8th ) extends continuously. Commercial vehicle tire according to claim 1 or 2, characterized in that two rubber layers ( 13 ) with an axial width (b ₃ ) of in each case 10% to 20% of the width (b ₁ ) of the 0 ° belt layer ( 8th ) are provided, wherein in the area between the rubber layers ( 13 ) the 0 ° belt layer ( 8th ) directly on the radially inside of the 0 ° belt layer ( 8th ) arranged belt layer ( 6 . 7 ) is located. Commercial vehicle tire according to one of claims 1 to 4, characterized in that the rubber layer (s) ( 12 . 13 ) have a substantially constant thickness of 1 mm to 2 mm.

Images